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From: root@dosadi.UUCP (Maintenance Account)
Newsgroups: net.micro
Subject: Re: Questions on TRS-80 Model I and Sinclair ZX81
Message-ID: <108@dosadi.UUCP>
Date: Sun, 14-Sep-86 05:53:14 EDT
Article-I.D.: dosadi.108
Posted: Sun Sep 14 05:53:14 1986
Date-Received: Mon, 15-Sep-86 18:48:51 EDT
References: <3767@brl-smoke.ARPA>
Lines: 46

> 
> 	First - A TRS-80 Model I...  With Expansion Interface, slave disk
> drive, monitor, and dot matrix printer (model 779 or 799? - huge hulking 
> monster for business applications).
779?  You mean that upper case only sucker?
> 
> 	Questions:  How, where and from whom can my friend purchase a master
> drive (RS SN 26-1160), and how much would they cost?  If someone out there has 
> an old one they want to get rid of, this is fine too...  Also, the printer is 
> a 36pin male, and the card edge it plugs into is 34 pins, so, does anyone have 
> the pin-outs for this?  ($30 for a cable is a bit much ).  And any other info 
> on this printer or a manual would be nice.  

All of the Radio Shack machines (even the old model 1) use regular disk
drives.  You can get any regular 40 track 5 1/4 inch disk drive 
(no apple drives,
they aren't standard) and plug it in.  Your drive 1 can also work as
drive 0 (assuming you could live with one drive).  If you add on a drive,
make sure that only the last drive on the chain has the little terminating
reisistor in it (It's the only socketed item on the logic board, if I
recall correctly).  You'll also need a copy of TRSDOS if you don't already
have one.

If you want to use something with the Radio Shack label on it, Color
Computer addon disk drives work in the model 1.

The printer cable is straight through.  They just don't connect pins 18 and
36 to anything.  I personally don't think the price is all that bad.  Try
pricing the connectors and cable sometime.  I think you'll only save $10
or so by making it yourself.  I'd rather pay the bucks and get a nice
machine made one.

> 
>      +---------------------------------------------------------------+
>      | E-MAIL: cayz@louie.udel.edu            PHONE: +1 302 451-6718 |
>      | USPS: James Cayz, Educational Technology Laboratory,          |
>      |       125 Evans Hall, University of Delaware, Newark DE 19716 |
>      +---------------------------------------------------------------+

-- 

/Dave Edick/

{hplabs,ihnp4}!qantel!dosadi!root

             "I come in peace, take me to your lizard"